[#CMS_decrypt]
= CMS_decrypt
:mrdocs:

Decrypt a CMS EnvelopedData or AuthEnvelopedData and write the content.

== Synopsis

Declared in `<openssl/cms.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CMS_decrypt(
    xref:CMS_ContentInfo.adoc[CMS_ContentInfo]* cms,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey,
    xref:X509.adoc[X509]* cert,
    xref:BIO.adoc[BIO]* dcont,
    xref:BIO.adoc[BIO]* out,
    unsigned int flags);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cms*
| Enveloped ContentInfo to decrypt.
| *pkey*
| Recipient private key, or NULL if a key was already set via CMS_decrypt_set1_*.
| *cert*
| Recipient certificate used to locate the matching RecipientInfo; may be NULL.
| *dcont*
| Detached encrypted‐content BIO when applicable; normally NULL.
| *out*
| BIO that receives the decrypted content (may be NULL when only setting up keys).
| *flags*
| Optional CMS decrypt flags (for example CMS_TEXT or CMS_DEBUG_DECRYPT).
|===


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